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 // Literals 1'b0 1'bx 1'bz 16'hDC78 'hdeadbeef 'b0011xxzz 1234 32'd5678 3.4e6 -128.7 // Macro definition `define BUS_WIDTH = 8; // Module definition module block( input clk, input rst_n, input [`BUS_WIDTH-1:0] data_in, output [`BUS_WIDTH-1:0]

            data_out ); always @(posedge clk or negedge rst_n) begin if (~rst_n) begin data_out

            <=8 'b0;

    end else begin

      data_out <= data_in;

    end

    if (~rst_n)

      data_out <= 8'b0; else data_out <=d ata_in; if (~rst_n) begin data_out <=8 'b0;

      end

    else

      begin

        data_out <= data_in;

      end

​

  end

endmodule

​

// Class definition

class test;

​

  /**

   * Sum two integers

   */

  function int sum(int a, int b);

    int result = a + b;

    string msg = $sformatf("%d + %d = %d", a, b, result);

    $display(msg);

    return result;

  endfunction

  task delay(int num_cycles);

    repeat(num_cycles) #1;

  endtask

endclass

​

​